US11647769B2 - Device for microwave aging and method for microwave aging - Google Patents

Device for microwave aging and method for microwave aging Download PDF

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US11647769B2
US11647769B2 US16/651,465 US201816651465A US11647769B2 US 11647769 B2 US11647769 B2 US 11647769B2 US 201816651465 A US201816651465 A US 201816651465A US 11647769 B2 US11647769 B2 US 11647769B2
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aging
microwave
food
chamber
temperature
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US20200268025A1 (en
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Hirofumi Soga
Katsuyuki Kunii
Eiji Kagawa
Tsubasa Ogawa
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Shikoku Instrumentation Co Ltd
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Shikoku Instrumentation Co Ltd
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    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
    • A23L13/00—Meat products; Meat meal; Preparation or treatment thereof
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
    • A23L17/00—Food-from-the-sea products; Fish products; Fish meal; Fish-egg substitutes; Preparation or treatment thereof
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
    • A23L17/00—Food-from-the-sea products; Fish products; Fish meal; Fish-egg substitutes; Preparation or treatment thereof
    • A23L17/40—Shell-fish
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
    • A23L27/00—Spices; Flavouring agents or condiments; Artificial sweetening agents; Table salts; Dietetic salt substitutes; Preparation or treatment thereof
    • A23L27/40—Table salts; Dietetic salt substitutes
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
    • A23L3/00—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs
    • A23L3/003—Control or safety devices for sterilisation or pasteurisation systems
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
    • A23L5/00—Preparation or treatment of foods or foodstuffs, in general; Food or foodstuffs obtained thereby; Materials therefor
    • A23L5/30—Physical treatment, e.g. electrical or magnetic means, wave energy or irradiation
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
    • A23L5/00—Preparation or treatment of foods or foodstuffs, in general; Food or foodstuffs obtained thereby; Materials therefor
    • A23L5/30—Physical treatment, e.g. electrical or magnetic means, wave energy or irradiation
    • A23L5/34—Physical treatment, e.g. electrical or magnetic means, wave energy or irradiation using microwaves
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/66—Circuits
    • H05B6/68—Circuits for monitoring or control
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/80—Apparatus for specific applications
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23V—INDEXING SCHEME RELATING TO FOODS, FOODSTUFFS OR NON-ALCOHOLIC BEVERAGES AND LACTIC OR PROPIONIC ACID BACTERIA USED IN FOODSTUFFS OR FOOD PREPARATION
    • A23V2002/00—Food compositions, function of food ingredients or processes for food or foodstuffs
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23V—INDEXING SCHEME RELATING TO FOODS, FOODSTUFFS OR NON-ALCOHOLIC BEVERAGES AND LACTIC OR PROPIONIC ACID BACTERIA USED IN FOODSTUFFS OR FOOD PREPARATION
    • A23V2300/00—Processes
    • A23V2300/20—Freezing

Definitions

  • the present invention relates to a microwave aging device that irradiates food with a microwave to age the food and a microwave aging method.
  • Distilled spirits are rough after distillation but become mild by storage. Since natural aging requires a long period of time, various controversies aside, artificial aging methods have historically received interest.
  • the artificial aging methods include a physical method, a chemical method, and a combination method.
  • One of the artificial methods of aging distilled spirits is an electrical processing method by which, for example, Noguchi (1949, 1951) aged liquor using altering current with either low frequency or high frequency. Maximov (1955) executed a process using a high-frequency wave and ozone, and rum whiskey was especially improved in quality. A method of combining these methods has also been devised rather than solely using each method (see Non-Patent Document 1).
  • Patent Document 1 Japanese Patent Laid-Open Publication No. 2015-123057
  • Non-Patent Document 1 Brewing Society of Japan, Vol. 60, No. 6, pages 24 to 27
  • An object of the present invention is to provide a microwave aging device and a microwave aging method that can shorten the time required for ageing food and can improve the yield rate.
  • Both microwaves and high-frequency waves are radio waves in specific frequency bands. Both are sometimes called high-frequency waves since having high frequencies. Frequencies of microwaves range from 300 MHz to 300 GHz, and frequencies of high-frequency waves range from 10 KHz to 300 MHz. Microwaves are characterized by the frequencies slightly higher than those of high-frequency waves. Both are widely utilized for communication, heating, and the like. In general, microwaves are used for heating things comparatively small in cross-sectional size and amorphous things, and high-frequency waves are used for heating things large in cross-sectional size and long things. In the present invention, a mode utilizing the range of microwaves out of high-frequency waves that are widely utilized for heating is assumed to be a preferable embodiment.
  • Microwaves are a kind of radio waves, and radio waves are a kind of electromagnetic waves and can travel even through vacuum. Since being “waves”, electromagnetic waves have two aspects of a wavelength and a frequency. Microwaves are radio waves having a wavelength in a range of 1 m to 1 mm.
  • a high-frequency wave aging device preferably a microwave aging device, according to the present invention includes a high-frequency wave aging unit, preferably a microwave aging unit, having an aging chamber configured to store food, an irradiation port through which high-frequency wave irradiation, preferably microwave irradiation, is performed into the aging chamber, and a blower fan configured to blow air into the aging chamber, a cooling unit having a cooling chamber that is cooled by a cooler, a high-frequency wave oscillating unit, preferably a microwave oscillating unit, connected to the irradiation port, and a controller, where the aging chamber is arranged in the cooling chamber.
  • microwave in a preferable mode is used as “high-frequency wave”.
  • microwave aging device In the microwave aging device, several minute openings configured to block microwaves and let air pass through may be formed in an interior wall of the aging chamber.
  • the several minute openings may be formed in each of a plurality of interior walls of the aging chamber.
  • the aging chamber may be comprised of a plurality of aging chambers.
  • the controller may be configured to control operation of the microwave oscillating unit to make an inner temperature of the food higher than a surface temperature of the food.
  • the controller may be configured to automatically control operation of the microwave oscillating unit to make the inner temperature of the food equal to or higher than 5° C. during aging.
  • the controller may be configured to automatically control operation of the cooler and/or the blower fan to make the surface temperature of the food lower than 5° C. during aging.
  • the controller may be configured to automatically control operation of the microwave oscillating unit, the cooler, and the blower fan to make a difference in temperature between the surface temperature and the inner temperature of the food equal to or larger than 3° C. during aging.
  • the microwave oscillating unit may be configured to perform microwave irradiation for one hour or more during aging.
  • the controller may be configured to cause the microwave oscillating unit to perform microwave irradiation for a certain duration and suspend microwave irradiation for a certain duration repeatedly during aging.
  • the cooling unit may include a UV lamp disposed in the cooling chamber.
  • a microwave aging method is a microwave aging method for aging food using a microwave and includes, through heating an inside of the food by microwave irradiation and cooling a surface of the food by blowing cold air simultaneously, making an inner temperature of the food higher than a surface temperature of the food to age the food.
  • the microwave irradiation and the blowing of cold air may be performed to make the inner temperature of the food equal to or higher than 5° C., the surface temperature of the food lower than 5° C., and a difference in temperature between the surface temperature and the inner temperature of the food equal to or larger than 3° C.
  • the food may be meat or seafood. Further, the food may be a foodstuff containing salt and, more specifically, may be selected from a ham and a cheese.
  • the food may be a foodstuff in a liquid, preferably in a liquid without microwave absorption, more specifically in an edible vegetable oil.
  • the present invention it is possible to make an inner temperature of food higher than a surface temperature of the food during aging, and therefore to shorten an aging period as well as to suppress bacterial proliferation on the surface of the food and reduce an amount of trimming.
  • FIG. 1 is a configuration diagram of a microwave aging device according to a first embodiment.
  • FIG. 2 is a configuration diagram of a microwave aging device according to a second embodiment.
  • FIG. 3 is a configuration diagram of a microwave aging device according to a third embodiment.
  • FIG. 4 is a configuration diagram of a cavity according to the third embodiment.
  • FIG. 5 is a table showing measurement results of amino acid content on each day of aging in the presence of continuous microwave irradiation.
  • FIG. 6 is a graph showing the measurement results in FIG. 5 .
  • FIG. 7 is a table showing measurement results of amino acid content in each aging condition.
  • FIG. 8 is a graph showing the measurement results in FIG. 7 .
  • FIG. 9 is a graph showing measurement results of glutamic acid content in each aging condition.
  • FIG. 10 is a diagram for explaining a test condition for a sensory test.
  • FIG. 11 is a graph showing results of the sensory test.
  • FIG. 12 is a diagram explaining a microwave aging experiment and a comparative experiment by comparison in an embodiment example using a raw ham.
  • FIG. 13 is a diagram explaining a microwave aging experiment and a comparative experiment by comparison in an aging experiment in a state of being immersed in an olive oil.
  • the figure includes a diagram of a typical microwave aging experiment in a state without plastic wrap as a reference diagram.
  • Aging is improvement of a state of food under a certain condition.
  • various aging mechanisms such as fermentation by microbial enzyme action, action of enzyme in food, mutual chemical reaction between constituents of food and a container, and physical change in a constituent of food.
  • aging is letting food stand to make it tasty.
  • denseness increases while water is lost, and amino acid as an umami component increases severalfold.
  • Aging is leaving food for a long time to let color, taste, fragrance, firmness, and the like of the food change, and to render the food favorable.
  • various ingenuity is exercised, for example, conditions of temperature, time, and the like are set, to turn the change in flavor into improvement in quality.
  • Umami of aged meat is increased due to decomposition of meat protein. Color of miso or soy sauce turns brown due to chemical reaction of amino acid or reduction sugar in the food, that is, Maillard reaction. This reaction also yields fragrant savor. Whisky absorbs a barrel constituent while being stored in a barrel, and turns golden brown. Balance among umami of amino acid resulting from decomposition of ingredients in the process of fermentation or aging, sweetness of sugar, and added salt is determinant.
  • a device and a method of the present invention has enabled reproduction of the aged flavor without relying on experience and intuition and without spending much time.
  • the present invention will be described using edible meat, especially beef, ham, and cheese as examples of foods to be aged.
  • foods that can be aged by the microwave aging device according to the present invention are not limited thereto, and edible meat other than beef, seafood, ham, sausage, cheese, vegetables, noodles, bread, and the like are also applicable.
  • aging to turn the change in flavor into improvement in quality, it is possible to contrive to immerse a foodstuff in a liquid, preferably in a liquid without microwave absorption (for example, an edible vegetable oil such as an olive oil), and set a temperature condition.
  • FIG. 1 is a configuration diagram of a microwave aging device according to a first embodiment.
  • a microwave aging device 1 according to the present embodiment is a device suitable for dry aging, and as shown in FIG. 1 , includes a cooling unit 10 , a microwave oscillating unit 20 , a microwave aging unit 30 , a controller 40 , and a UV lamp 50 .
  • the microwave aging device 1 has the microwave aging unit 30 , the controller 40 , and the UV lamp 50 inside the cooling unit 10 .
  • Food to be aged is meat, seafood, vegetables, noodles, or bread.
  • the cooling unit 10 is a device that cools the inner space of the cooling unit 10 with cold air.
  • the cooling unit 10 has a cooler 11 , a first fan 12 , a cooling chamber 13 , and a cooling chamber door 14 not shown.
  • the cooler 11 generates cold air by exchanging heat with the outside
  • the first fan 12 blows the generated cold air into the cooling chamber 13 inside the cooling unit 10 . This can lower the temperature in the cooling chamber 13 .
  • the controller 40 appropriately controls operation of the microwave oscillating unit 20 and the like and the temperature in the cooling chamber 13 to make a surface temperature of the food to be aged lower than an inner temperature of the food. Further, a user can open the cooling chamber door 14 to put the food to be aged in or take it out from the microwave aging unit 30 disposed in the cooling chamber 13 .
  • the microwave oscillating unit 20 generates a microwave for irradiating the food M.
  • an oscillator using a magnetron may be used.
  • a solid-state oscillator is used, the solid-state oscillator using a semiconductor element that can achieve high frequency and high output stability compared to a magnetron.
  • the microwave oscillating unit 20 generates microwaves while continuously changing their frequencies between 2.4 to 2.5 GHz.
  • the microwaves generated by the microwave oscillating unit 20 are emitted from an irradiation port 31 of the microwave aging unit 30 via a cable 21 .
  • the continuous change of the microwave frequency between 2.4 to 2.5 GHz results in uniform electromagnetic field distribution in the microwave aging unit 30 , which makes it possible to irradiate the food M with uniform microwave distribution and promote uniform heating (uniform aging) of the food M.
  • the microwave aging unit 30 includes the irradiation port 31 , a second fan 32 , an aging chamber 33 , and an aging chamber door 34 not shown. A user can open the aging chamber door 34 to put the food M to be aged in and take it out from the aging chamber 33 .
  • the aging chamber 33 is a cavity of which inner surfaces (interior walls) are all equipped with a reflection board for reflecting microwaves.
  • the irradiation port 31 is disposed through which microwaves generated by the microwave oscillating unit 20 are emitted into the aging chamber 33 .
  • a small patch antenna (planar antenna) with a high gain is attached to the irradiation port 31 , and the microwaves generated by the microwave oscillating unit 20 are emitted into the aging chamber 33 by the antenna.
  • a shelf made of microwave permeable material such as Teflon (registered trademark) and polypropylene may be disposed.
  • the second fan 32 blows the cold air in the cooling chamber 13 into the aging chamber 33 .
  • the second fan 32 employs a fan capable of blowing air at an air volume suitable for dry aging (for example, 0.5 to 10.0 m/sec).
  • the second fan 32 is attached to the outside of the aging chamber 33 , and first minute openings 35 are formed in a side wall of the aging chamber 33 to which the second fan 32 is attached.
  • the size of the first minute openings 35 is shorter than the wavelengths of microwaves and, for example, in the present embodiment, is 10 mm or smaller in diameter.
  • the first minute openings 35 block the microwaves emitted into the aging chamber 33 and let only the cold air blown by the second fan 32 pass through.
  • second minute openings 36 with a similar diameter to the first minute openings 35 are formed in a side wall of the aging chamber 33 opposed to the first minute openings 35 .
  • the second minute openings 36 block the microwaves emitted into the aging chamber 33 , but the air heated by heat exchange with the food M in the aging chamber 33 passes through the second minute openings 36 and is exhausted into the cooling chamber 13 .
  • the first minute openings 35 and the second minute openings 36 may be formed in an area occupying a large part of one or more side walls to enhance airflow.
  • the aging chamber 33 may be constituted using punching metal in which the first minute openings 35 and the second minute openings 36 are formed in advance, and stainless board having openings of ⁇ 10 mm may be used as such punching metal.
  • a program for temperature control is embedded which makes the surface temperature and the inner temperature of the food M to be aged respective predetermined temperatures. Specifically, through controlling operation of the microwave oscillating unit 20 , the cooler 11 , the first fan 12 , and the second fan 32 , the controller 40 controls output levels of microwaves from the microwave oscillating unit 20 , a temperature of cold air from the cooler 11 , and volumes of air blown by the first fan 12 and the second fan 32 to perform the temperature control.
  • the controller 40 can raise the inner temperature of the food M, and through lowering the temperature of the cold air from the cooler 11 or increasing the volumes of air blown by the first fan 12 and the second fan 32 , the controller 40 can lower the surface temperature of the food M.
  • the controller 40 may be configured to control the microwave oscillating unit 20 such that microwave irradiation is switched ON and OFF at regular intervals (for example, every few hours).
  • the controller 40 may control the microwave oscillating unit 20 such that microwave irradiation is performed for three hours and then microwave irradiation is suspended for three hours, and similarly, irradiation with microwave and suspension of the irradiation occur alternately every three hours, for example, for the whole seven days of an aging period.
  • the controller 40 may be connected with temperature sensors that measure the inner temperature and the surface temperature of the food M (for example, Fiber Optic Thermometer (manufactured by Anritsu Meter Co., LTD.) capable of making a contact temperature measurement even in an environment subject to a microwave and a radiation temperature sensor that makes a contactless measurement of intensity of an infrared ray or visible light), and may be configured to appropriately perform the temperature control based on measurement results obtained by the temperature sensors.
  • temperature sensors that measure the inner temperature and the surface temperature of the food M
  • Fiber Optic Thermometer manufactured by Anritsu Meter Co., LTD.
  • a radiation temperature sensor that makes a contactless measurement of intensity of an infrared ray or visible light
  • the controller 40 may be configured to store, in advance through a test, relationship between weights and water amounts of the food M and output levels of microwaves from the microwave oscillating unit 20 , temperatures of cold air from the cooler 11 , and volumes of air blown by the first fan 12 and the second fan 32 for making the surface temperature and the inner temperature of the food M predetermined temperatures; and to control the output levels of microwaves from the microwave oscillating unit 20 , the temperature of the cold air from the cooler 11 , and the volumes of air blown by the first fan 12 and the second fan 32 depending on a weight and a water amount of the food M obtained from a weight scale and a contactless moisture meter disposed in the aging chamber 33 .
  • the controller 40 includes an input device such as an operation button or a touch panel, and in response to an input of information of food to be aged such as a type of the food (for example, beef, pork, or chicken) and a size of the food, automatically performs control to make the surface temperature of the food higher than the inner temperature of the food.
  • an input device such as an operation button or a touch panel
  • the microwave aging unit 30 can heat not only the surface of the food M but also the inside of the food M when performing microwave irradiation. Warming the inside of the food M can promote aging of the food M, but warming the surface of the food M would cause proliferation of bacteria adhered to the surface of the food M.
  • the cooling mechanism that is, the cooling unit 10 and the second fan 32 operate to cool the surface of the food M, which allows for suppressing the proliferation of bacteria adhered to the surface of the food M.
  • the heating mechanism (the microwave oscillating unit 20 and microwave aging unit 30 ) heats the food M and, at the same time, the cooling mechanism (the cooling unit 10 and the second fan 32 ) cools the surface of the food M
  • the controller 40 controls operation of the heating mechanism and the cooling mechanism to make the inner temperature of the food M higher than the surface temperature of the food M. More specifically, the controller 40 performs temperature control to make the inner temperature of the food M equal to or higher than 5° C., and the surface temperature of the food M lower than 5° C.
  • microwave aging device 1 controls the output of the microwave oscillating unit 20 , the temperature of cold air from the cooler 11 , and the volumes of air blown by the first fan 12 and the second fan 32 to make a difference between the inner temperature and the surface temperature of the food M equal to 3° C. or larger.
  • Microwave irradiation does not have to be continuously performed throughout the aging of the food M, and may be performed for at least one hour or more (preferably for three hours or more, more preferably for five hours or more).
  • the UV lamp 50 is a device that generates an ultraviolet ray.
  • a part (at least a UV lamp 50 side part) of walls of the aging chamber 33 is configured to let ultraviolet rays pass through, and the surface of the food M placed in the aging chamber 33 may be irradiated with an ultraviolet ray generated by the UV lamp 50 during aging of the food M.
  • the controller 40 can also control operation of the UV lamp 50 .
  • the controller 40 can control the UV lamp 50 to emit an ultraviolet ray for a certain duration (for example, a few hours) from the time when aging is started or the time when the aging chamber door 34 is closed (after having been opened).
  • the microwave aging device 1 includes the microwave aging unit 30 that irradiates the food M with a microwave and the cooling unit 10 that cools the surface of the food M, and is configured to simultaneously heat the inside of the food by the microwave aging unit 30 and cool the surface of the food by the cooling unit 10 and the second fan 32 , thereby making the inner temperature of the food M higher than the surface temperature of the food M to age the food M.
  • This makes it possible to suppress proliferation of bacteria resident on the surface of the food M while promoting the aging of the food M. Further, by suppressing proliferation of bacteria resident on the surface of the food M and promoting the aging of the food M, an amount of the surface of the food M to be pared away, that is, trimmed, can be reduced and a yield rate can also be improved.
  • microwaves enhance activity of enzyme such as protease, and thus irradiating the food M with a microwave for aging can further promote the aging of the food M.
  • the microwave aging device 1 can promote the aging of the food M while suppressing proliferation of bacteria resident on the surface of the food M, also bringing an advantageous effect that aging of chicken and pork, which has typically been difficult due to quick decay, can be easily carried out.
  • the controller 40 controls the output levels of microwaves from the microwave oscillating unit 20 , the temperature of cold air from the cooler 11 , and the volumes of air blown by the first fan 12 and the second fan 32 during aging of the food M through heating of the inside of the food by the microwave aging unit 30 to make the inner temperature of the food M equal to or higher than 5° C. and the surface temperature of the food M lower than 5° C., and more preferably, to make a difference between the inner temperature and the surface temperature of the food M equal to 3° C. or larger. This makes it possible to promote the aging of the food M while suppressing proliferation of bacteria resident on the surface of the food M more effectively.
  • FIG. 2 is a configuration diagram showing an example of the microwave aging device 1 a according to the second embodiment.
  • the microwave aging device 1 a according to the second embodiment is similar to the microwave aging device 1 according to the first embodiment except that an aging chamber door 34 of an aging chamber 33 has a choke structure and can be opened and closed from the outside.
  • the same structures as those in the first embodiment are denoted by the same reference symbols and explanations thereof are omitted.
  • the aging chamber door 34 of the aging chamber 33 can be opened and closed directly from the outside. Further, in the second embodiment, the aging chamber door 34 of the aging chamber 33 has a choke structure to prevent a microwave from leaking to the outside.
  • the choke structure can be formed as a publicly known structure.
  • the microwave aging device 1 a makes it possible to put food M in and take it out from the aging chamber 33 directly from the outside. Further, in the second embodiment, since the aging chamber door 34 has a choke structure, it is possible to effectively prevent a microwave from leaking to the outside.
  • FIG. 3 is a perspective view showing an example of the microwave aging device 1 b according to the third embodiment
  • FIG. 4 is a perspective view showing an example of a microwave aging unit 30 a according to the third embodiment.
  • a cooling unit 10 has two cooling chambers 13 in each of which a microwave aging unit 30 a (an aging chamber 33 ) is disposed.
  • the microwave aging unit 30 a has a two-stage structure in which the aging chamber 33 is divided into upper and lower stages by a net plate 37 , and food M can be placed in each of the upper and lower stages.
  • a second fan 32 is attached to the back surface of each of the stages, and operates to blow cold air in the cooling chamber 13 into the aging chamber 33 .
  • minute openings 36 are formed in a large part of both side surfaces of the microwave aging unit 30 a , and the air that has been blown from the cooling chamber 13 into the aging chamber 33 and then has exchanged heat with the food M is exhausted into the cooling chamber 13 through the minute openings 36 , which can effectively lower the surface temperature of the food M.
  • the foreside of the microwave aging unit 30 a is open, and a choke structure 38 is formed on the opening edge.
  • a cooling chamber door of the cooling chamber 13 is also used as an aging chamber door 34 of the aging chamber 33 , and the choke structure 38 can effectively prevent a microwave from leaking to the outside.
  • the door face may be formed to have a double structure using a punching metal plate and a transparent plate so that aging progression degree or the like of the food M inside the aging chamber 33 can be checked without opening the door while microwave leakage prevention and heat insulation functions are kept.
  • Material of the transparent plate is not particularly limited and, for example, may be glass, polycarbonate resin, or the like.
  • the structure may be formed to have two transparent plates laminated with an air layer therebetween, which improves the heat insulation function.
  • an irradiation port 31 and a lighting unit 39 are arranged on an upper surface of the microwave aging unit 30 a .
  • microwave irradiation is performed into the aging chamber 33 through the irradiation port 31 .
  • the lighting unit 39 has an LED light source that lights the inside of the aging chamber 33 and, for example, lights the inside of the aging chamber 33 when the aging chamber door 34 is opened.
  • the microwave aging device 1 b since the microwave aging device 1 b according to the third embodiment has the two cooling chambers 13 and the two aging chambers 33 , it is possible to increase an amount of food M to be aged at once. Additionally, since the aging chamber 33 is divided into the upper and lower stages and the second fan 32 is included in each of the stages, even when a large amount of food M is to be aged, it is possible to appropriately lower the surface temperature of the food M. Further, in the third embodiment, since a commercially available refrigerator may be utilized as the cooling unit 10 , it is also possible to reduce production cost.
  • the inventors carried out the following tests to verify an aging effect of food obtained from the microwave aging device according to the present invention. Specifically, the inventors built a prototype with the same configuration as the microwave aging device 1 according to the first embodiment and carried out each test.
  • FIGS. 5 and 6 show the measurement results of the amino acid content on each day of aging in practical example 1
  • FIG. 6 is a graph of the measurement results shown in FIG. 5 . Focusing on the total amount of amino acid, the total amount of amino acid at the beginning (on the zeroth day) was 375.4 mg/100 g, the total amount of amino acid on the sixth day of aging was 745.9 mg/100 g, and the total amount of amino acid on the ninth day of aging was 1128.1 mg/100 g. As can be seen from these results, the microwave irradiation to a beef round caused the total amount of amino acid to increase about twofold in six days of aging, and about threefold in nine days of aging.
  • FIG. 7 shows the measurement results of the amino acid contents for (A) to (D) described above in practical example 2
  • FIG. 8 is a graph of the measurement results shown in FIG. 7 .
  • the total amount of amino acid of (B) the beef round aged for seven days without microwave irradiation was increased by 44.9 mg/100 g with respect to that of (A) the beef round before aging.
  • the total amount of amino acid of (C) the beef round aged for seven days with microwave irradiation just for six hours was increased by 96.5 mg/100 g
  • the total amount of amino acid of (D) the beef round aged for seven days with microwave irradiation just for 20 hours was increased by 232.5 mg/100 g, with respect to that of (A) the beef round before aging.
  • FIG. 9 shows measurement results of glutamic acid content measured on each day of seven-day aging for the cases of: a typical aging method in which microwave irradiation is not performed; and an aging method according to the present invention in which microwave irradiation is performed.
  • Glutamic acid is amino acid relevant to umami and may also be an index indicating umami of beef. Note that the beef that was aged by the typical aging method and the beef that was aged with microwave irradiation according to the present embodiment were of different types, and thus, as shown in FIG. 9 , contained different amounts of glutamic acid at the beginning of aging.
  • the glutamic acid content was significantly increased in the presence of microwave irradiation as compared with that in the absence of microwave irradiation. Specifically, while the glutamic acid content resulting from seven-day aging by the conventional aging method without microwave irradiation increased 1.52-fold, the glutamic acid content resulting from seven-day aging by the aging method with microwave irradiation according to the present embodiment exhibited a significant increase of 2.60-fold. It turned out that an increment (increasing rate) of glutamic acid tends to get larger as an aging period progresses in the presence of microwave irradiation.
  • FIG. 10 is a diagram for explaining an aging condition of each sample in practical example 4. As shown in FIG. 10 , in the case of (E) the beef round aged for seven days with continuous microwave irradiation, aging was carried out under such temperature control that the temperature of the cooling chamber would be ⁇ 2° C., the surface temperature of the beef round would be 2° C., and the inner temperature of the beef round would be 8° C.
  • FIG. 11 shows results of the sensory test in practical example 4.
  • the sensory test was carried out by three connoisseurs in Japan Meat Science & Technology Institute. In the sensory test, a beef round without aging was assumed as a reference (zero points), and each of items including acrid odor, offensive taste, aged flavor, richness, umami, juiciness, tenderness, and total was evaluated on a seven-point scale from ⁇ 3 points to +3 points.
  • FIG. 12 shows a diagram explaining a microwave aging experiment and a comparative experiment by comparison.
  • Table 1 shows tasting results of the raw hams. As shown in Table 1, when ten testers compared the hams by eating, (1) obtained better ratings than (2) in saltiness from nine testers, in mildness from eight testers, and in total from eight testers.
  • a chef of an Italian restaurant indicated an evaluation that mild saltiness similar to a raw ham after eighteen-month aging (ready-made product) was experienced.
  • the present invention can be widely applied to foodstuffs containing salt such as miso and soy sauce.
  • FIG. 13 shows a diagram explaining a microwave aging experiment and a comparative experiment by comparison.
  • FIG. 13 also shows a diagram of a typical microwave aging experiment in a state without plastic wrap as a reference diagram. Expected effects are as follows.
  • a foodstuff in which water has been reduced is sometimes overcooked, and entails difficulty in adjusting doneness level in cooking.
  • the foodstuff that has been processed by the present method has no change in water content rate, which allows for easy cooking.
  • 300 g of beef round was covered with food wrap film, and aged without microwave irradiation for five days in a refrigerator in which the temperature was 3° C.
  • the beef in the microwave aging experiment and the beef in the comparative experiment exhibited no change in weight after the process.
  • Table 2 shows tasting results of the meat immersed in the olive oil. As shown in Table 2, when ten testers compared the beefs by eating, (1) obtained better ratings than (2) in tenderness from seven testers, in taste from eight testers, and in total from eight testers.
  • liquid or as a liquid without microwave absorption, preferably an edible vegetable oil, another edible oil may be used instead of an olive oil.
  • Edible vegetable oils fall into categories according to the sources, such as oils extracted from oilseeds (soy, rapeseed, sesame, cottonseed, linseed, and the like), oils extracted from agricultural by-products (rice bran and corn germ), and oils imported from abroad (palm oil, olive oil, sunflower oil, castor oil, and the like), and any of them can be used depending on food to be aged.
  • a measuring scale that measures a weight of food M placed in the aging chamber 33 may be installed at the bottom of the aging chamber 33 .
  • aging degree of the food may be determined based on a change in weight of the food and presented to a user.
  • a contactless moisture meter may be further included, and the aging degree of the food may be determined depending on a change in weight of the food and a change in water content of the food.
  • a configuration in which frequencies of microwaves are set within 2.4 to 2.5 GHz is shown as an example.
  • the present invention is not limited to this configuration, and frequencies in a range of, for example, 300 MHz to 300 GHz may also be used.

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CN112652821A (zh) * 2021-01-25 2021-04-13 唐山航天万源科技有限公司 一种锂电池的老化方法
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